Radeon Rx Vega 56 issues

Ever since I bought MSI Radeon Rx Vega 56 I have had problems with it. It crashes in almost every game, lags or black screens. When the screen turns black, I can still hear the sound from the game normaly in the background. All 8 dots on the graphic card is turned on and stays that way. In idle after a game crashes the temp is 74C and stays that way until I restart the computer.